|Actor:||Michael Slagenweit Coffman|
|Stationed:||USS Grissom (NCC-638).|
|Rank:||Lieutenant junior grade|
Juan Casas was a member of Admiral Harry Morrow's command team at Starfleet Command, San Francisco, Earth and was assigned as a security officer to the USS Grissom (NCC-638) in 2285. (Star Trek: Grissom)
Casas was among those killed when the Grissom was destroyed in 2285 by a Klingon Bird-of-Prey (Star Trek III: The Search for Spock)
- 2257: Born in Cordoba, Andalucia, Spain Earth.
- 2285: Dies in orbit of the Genesis Planet in the Mutara sector